Triple-valve device



c. c. FARMER TRIPLE VALVE DEVICE Filed on. 17. 1924- INVENTOR CLYDEC. FARMER ATTORNEY Patented July 21, 1925.

UNITED STATES PAT'ENTT OFF-ICE CLYDE C. FARMER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO'THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

TRIPLE-VALVE DEVICE.

Application filed October 17, 1924. Serial No. 744,177.

T 0 all whom it may concern:

Be it known that I, CLYDE C. FARMER, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Triple-Valve Devices, of which the following is a specilication.

This invention relates to fluid pressure brakes, and more particularly to means for controlling the How of fluid to the brake cylinder in an emergency application of the brakes.

v.Vhen an emergency application of the brakes is made on a long train, the brakes may be applied with force on the cars at the head end of the train, while the brakes on the cars at the rear end of the train areonly lightly applied and this may cause the slack to run in and thereby produce shocks.

It has heretofore been proposed to provide means for delaying the build up of brake cylinder pressure in an emergency application of the brakes, so as to secure a more nearly simultaneous application of the brakes throughout the train. While delaying the build up of brake cylinder. pressure in an emergency application is desirable on long slow speed freight trains, it is not necessary on short high speed trains.

The principal object ofmy invention is to provide improved means for retarding thebuild up of brake cylinder pressure in an emergency application of the brakes and for automatically cutting out the retarded emergency action under certain conditions of high speed short train service.

In the accompanying drawing, the single figure is a sectional view of a triple valve device embodying my invention.

The triple valve device shown in the drawing comprises a casing 1 having a piston chamber 2 connected to the brake pipe 3 and containing piston 4 and having a valve chamber 5 connected to the auxiliary reservoir 6 and containing a main slide valve 7 and a graduating slide valve 8 adapted to be operated by piston 41.

Contained in the triple valve casing is an emergency valve mechanism comprising an emergency piston 9, the chamber 10 at one side of which is provided with a port 11 leading to the seat of slide valve 7.

Operable by piston 9 is an 2 emergency valve 12 contained in valve chamber 13, and mounted in said piston is a check valve 11,

biased to open position by, a spring 15 andhaving' a restricted port 16 extending through the check valve.

Also mounted in valve chamber 13 is a v valve piston 17, having a downwardly eX-- ton 22 carrying a valve 23 and subject to the pressure of a coil spring 24. The valve 23 controls communication from a passage 25, leading to piston chamber 10 to piston' chamber'26 of the piston 22 and piston 22 controls communication from piston chamber 26 to a'passage 27, leading to valve chamber 13. I a

In operation, upon" a sudden reduction in brake pipe pressure, the triple'valve piston 4 is moved to emergency position and the main slide valve 7 isshifted, so that' passage 11 is uncovered, permitting fluid from valve chamber 5 and the auxiliary reservoir 6 to flow to piston chamber 10. The emergency piston 9 is thereby shifted to its seat 28 and the check valve 14 isseated in said piston.

The movement of piston 9 opens the emergency valve 12, so that fluid in valve chamber 13 is vented tothe brake cylinder 29.;

Brake pipe pressure acting on the under side of piston 17 then operates to unseat the piston, permitting fluid from the brake pipe to be vented to the brake cylinder.

\Vhen the piston 17 has moved'sufiiciently to take up the lost motion between the flanges 19 and 20, the valve 21 will be unseated, so as to vent fluid from the brake pipe to the atmosphere.

When the brake pipe pressure has been reduced to a point slightly less than the pressure in chamber 13 and the brake cylinbrake &

spring 15', slightlyexeeed' s the reduced auxiliary reservoirpressure afcti'n V e in Ch e thefchec k al e l4 will be unseated', permit time v l r iepiclg qr l at b f auxi ary f reservoir; pressure ln'to the bra e jcyhnder.

di 'g the Pr nt invent h area of valjve 23'is subject to the pressure of fluid supplied to piston cham- 2. 119 ,f em the au i r se vjq r. in an erner 'ncy application lhe spring 24 is of Se h f ce th'at the valve 23 will be held sea el Wreath auxiliary reservoir pressureaet'ing on the seated arearis less than a '.i .a ogmt sr has 110 rows. I ry re erv ir re exceeds Q pounds, as would be the case w v henth ur e earr'ied in the brake ystem i at a e Pr he inja ii e cy p icas d whenfluid fron thejauxiliary reserv r 11 supplied to p ston chamber 10 in an emergency application or the brakes and the full area io'f piston 22 being then exposed to auxiliary reservoir pressure, the pistoh 22 will beguickly shifted outwardly,so as to pen c mmun atio r m ra 'sa 9 piston "chamberfifi. lu'id under pressure can then f "n1 theyauxili ary reservoir th rQug h pas sage QS to iste'n chafnber 2f and thence through passage '27 to valve cham- From va cham er fl d, iflev Pa tf h Q'P'Q LWIYB 2.1 0, the brake cyl d 29, so that when the pressure carried in the bralre syst ll and. in the auxiliary reservoir exceed "a predetermined degree the flow of fluidto the 'hrakepyhnder isfiflapid and is n'o" limited or retarded flow through the s ricf d, 1 01.". 6, 1 h e W 1efl t is cjl'if'stoinaryfto err'i'pl'oy 'a lbrake pipe pres e ofllQ pounds'or less on long'trains Operating in low speed freight train'service and a higher brake pipe pressure "oh :short trains operating in high speed train service, so that with my present invention, the retarded emergency feature is in effect on long slow 'speedfreizght trains where a brake pipe pressure of 110 pounds or -less is carried, while on short high speed trains, where a higherrer'ake pipe pressure is carried, the retarded emergency feature is'cut out, and a quick "build up ortrare cylinder pressure in emergency is automaticallyproduced, h

Having now described invention, what I cla'iin as new and desire to secure by Letters Patent, is':'- V x Ina fluid pressurebrake, the combinati'onwi th a brake pipe, brake cylinder, auxiliary reservoir, and a valve device'o'pcratd upon a sudden reduction in brake pipe pressure for supplying fluid from the auxiliary reservoir to the brake cylinder, of ineans for li itin the rate of flow of fluid frointh' auxiliary reservoir to the brake cylinder and 'me'ans 1 operating when "the auxiliary reservoir pressure exceeds a predeterrniired degree foreffecting a inore rapid flow of fluid from the auxiliary reservoir to tliebrakecylinder. i I

Quln a fluid pressure brake', the"coinbi1iawith a brake pipe, brake cylinder, auxilia'ry reservoir, "and a valve device operated upon a sudden reduction in brake pipe pressure for supplying-fluid from the auxiliary reservoir to the brake cylinder at a restricted rate, of means operating I when the auxiliary reservoir pressure exceeds a predetermined degree forsupplying fluid fronifthe auxiliary reservoir to the brake cylinder at a rapid rate. U I p 3 a fluid pressure brake, the c mbination with a brake pipe, brake cylinder, auxil iary 'reseryoi g and a valve device operated 111mm sudden reduction brake pipe pressure for supplying "fluid from the auxiliar reservoirfto the brake cylinder, of means havihga restricted port through which fluid is supplied from the auxiliary reservoir to the brake cylinder in an emergency application of the brakes, and means subject to the unrestricted flow of from the auxiliary reservoir and operated at a predetermined pressure in the auxiliary reservoir for opening a largecoin'inunication frointhe auxiliary reservoirto the brakecylinder.

In testimony whereof I have hereunto set my hand.

CLYDE c. I 

